ruby-on-rails - rails/事件记录 : not retrieving the correct column through a join with a has_one/belongs_to relationship

Question

模型

class Feature < ActiveRecord::Base
  belongs_to :agency_feature
  ...
end

class Agency < ActiveRecord::Base
  has_many  :agency_features, dependent: :destroy
  ...
end

class AgencyFeature < ActiveRecord::Base
  belongs_to :agency
  has_one :feature
end

架构

create_table "agency_features", force: true do |t|
  t.integer "agency_id"
  t.integer "feature_id"
  t.boolean "enabled"
end

add_index "agency_features", ["agency_id"], name: "index_agency_features_on_agency_id", using: :btree
add_index "agency_features", ["feature_id"], name: "index_agency_features_on_feature_id", using: :btree

问题

Agency.first.agency_feature 给我:

<AgencyFeature id: 508, agency_id: 1, feature_id: 1, enabled: false>

和Agency.first.agency_features.first.agency返回正确的机构。

问题是 Agency.first.agency_features.first.feature 给出了一个column doesn't exist 错误并且正在尝试寻找 "agency_feature_id" 功能内部。

如何让它查找 ID 与 AgencyFeature 中的“feature_id”属性对应的特征？

Answer 1

也许再次尝试运行迁移。我同意 Marnuss 的观点。我认为您的功能表中没有字段 agency_feature_id 。它应该看起来像 -

create_table "features", force: true do |t|
  t.integer "agency_feature_id"
  ...
end